5
Oilless Reciprocating Air Compressor Pumps
Valve Inspection/ Replacement (Inspect Every 5,000 Hours)
INSPECT VALVE SET
1. Remove head bolts from cylinder
head. Head bolts for some models
are used also as cylinder bolts, which
penetrates crankcase (See Figure 7).
2. Remove cylinder head and valve set.
If it is difficult to remove by hand,
insert screwdriver between cylinder
and valve set and remove.
INSPECTION AND MAINTENANCE
1. Check if exhaust valve (A) sticks to
seat or is damaged (See Figure 8).
2. Check if there is breakage, gouge or
damage to appearance of intake
valve (B).
3. Lift intake valve by 10 mm and
check if there is peeling and wear
on coating surface of valve spacer
(C).
Lifting intake
valve too much can
cause damage to intake valve.
4. Replace with intake valve if valve
plate and valve spacer are worn or
wear is over 0.5 mm in depth. If
exhaust valve rises upwards, clean
seat surface if foreign matter sticks.
5. Clean the whole valve set taking care not to damage, seat surface and remove
dust.
6. If viton seals (upper and lower) reach inspection time, replace them. Even if its
not time to inspect, be sure to replace if they do not protrude from groove for
seal or seal has hardened or been damaged.
7. Be sure to replace plastic seat in cylinder.
8. Fit valve set while paying attention to black plastic seat of intake valve fitted to
cylinder (so that you do not drop seat or insert tip of valve under seat).
9. Fit cylinder cover and tighten fitting bolt with designated torque.
NOTES:
• When using valve set again, replace upper and lower viton seals.
• When replacing valve set, replace with upper and lower viton seals (valve set
with packing set). You cannot reuse disassembled valve set.
We are not responsible for any problems caused by reuse of disassembled valve
set.
REASSEMBLY
Assemble in reverse order of disassembling. Tighten each section with designated
tightening torque (See Chart on page 6).
!
CAUTION
(B)
Check for peeling
or wear (C)
(A)
(A)
Figure 6
Figure 7
Figure 8
